Bian Xiao takes you to see the background of that era. Ming Taizu took "no access to the sea" as his ancestor system and wrote it into Daming Law, which had ideological limitations and parochialism, as well as political and economic background at that time. The economic reason is that the commodity economy in the early Ming Dynasty was obviously retrogressed compared with the Song Dynasty because of years of war, and the business tax revenue dropped sharply. There are three main problems: first, the problems of Zhang Shicheng and Fang Guozhen; second, the problems of the enemy and the remnants of the Yuan Dynasty.
After the Yuan Dynasty's two expeditions to Japan failed, the official contact was cut off. In order to get supplies from China, the Japanese constantly plundered the coast of China. When the Hu case happened, it was suspected that the Japanese had helped Hu rebel. "I was very angry with Japan and decided to stop it just to prevent Haifu." In the seventeenth year of Yongle, Liu Rong, the company commander, won the victory of destroying the enemy in Liaodong. Although the enemy has been greatly reduced, it has never been eradicated.
Mengyuan is still there, and the strategic focus of the Ming Dynasty is that Mongolia is a pirate in the north, not a pirate in the southeast. The remnants of Zhang Shicheng, Fang Guozhen and other pirate groups are hard to annihilate, so it is necessary to make sure that Meng Yuan, the biggest enemy in the Central Plains, is the king. Therefore, the maritime ban weakened the hostile forces in the early Ming Dynasty and did not take the initiative to confront Meng Yuan.
Before the15th century, although human understanding of the ocean was progressing, it was still in a shallow and partial state due to the limitation of historical conditions, mainly due to the development of human society. In this historical process, the mainstream of human society is primitive society, slave society and feudal society; The development of productivity is relatively slow, and the scope of commodity production, especially exchange, is very limited, which makes the communication demand on the ocean limited and large-scale ocean navigation.
Even the opening of global routes lacks socio-economic motivation, so human marine practice is very limited, and the understanding of the ocean is only superficial, and the waters reached are only partial. People don't know the whole picture of the ocean, how big the ocean is in the world, how the ocean and land are distributed and what is the relationship.
After World War II, the concept of ocean jumped to "the ocean is an important space for human survival and development". This new understanding has promoted new practice and prompted people to go to the ocean one after another, and many countries have set off a wave of marine development.